JP3163915B2 - Buckle structure of vehicle seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buckle structure for a vehicle seat.

[0002]

2. Description of the Related Art As a conventional buckle structure for a vehicle seat, for example, there is one shown in FIGS. 7 to 9 (see European Patent Application Publication No. 0375636A1).

[0003] Reference numeral 1 denotes a rear seat of an automobile, which comprises a seat cushion 2 and a seat back 3. The seat cushion 2 is attached to the cross member 4 of the passenger compartment floor F ₁ (see FIG. 8) via a front end hinge 5, and the entire seat cushion 2 can be raised and rotated about the front end hinge 5. Further, the seat back 3 is attached to the front end of the luggage compartment floor F ₂ via the lower end hinge 6, and the entire seat back 3 can be tilted forward about the lower end hinge 6 after the seat cushion 2 is turned upright. It has become.
Thus, to cover the passenger compartment floor F ₁ after the seat cushion 2 is upright pivot the seatback 3 with a horizontal state, to utilize the back of the seat back 3 as an extension of the luggage compartment floor F ₂ it becomes possible, luggage compartment floor F ₂
Can be substantially expanded.

[0004] _On the rear slope of the passenger compartment floor F1,
A striker 7 having a hook-shaped cross section is fixed,
The wire frame 8 disposed on the rear surface of the seat cushion 2 is engaged with the striker 7. Therefore, even if an excessive forward inertia force that cannot be tolerated by the front end hinge 5 alone is applied, the wire frame 8 of the seat cushion 2 is engaged with the striker 7,
The forward movement A (see FIG. 9) of the seat cushion 2 can be reliably prevented.

As a seat belt device for the rear seat 1 having such a structure, a buckle 10 connected to an anchor portion 9 fixed on the striker 7 includes a rear end portion 11 of the seat cushion 2 and a seat back 3. The tongue 14 inserted through the webbing 13 is inserted into the insertion opening 12 of the buckle 10 and is engaged with the upper surface of the seat cushion 2 through a gap S between the buckle 10 and the buckle 10.

[0006]

However, in such a conventional technique, when the seat cushion 2 is used by being erected and rotated, the buckle 10 falls from the upper surface of the seat cushion 2 and the passenger compartment floor. since the state of being placed directly on F _1, the buckle by vibrations caused during the running 10
There move around on the cabin floor F _1, there is a possibility that uncomfortable rattling sound. For this purpose, a hook 15 (see an imaginary line in FIG. 9) corresponding to the tongue 14 is formed in a portion not in the way of the seat back 3 so that the buckle 10 can be used when the seat cushion 2 is used by standing up and rotating. Is engaged with the hook 15 and then the seat back 3 is tilted forward, but the operation of engaging the buckle 10 with the hook 15 every time the seat cushion 2 is raised and rotated is cumbersome. There is room for improvement in operability.

The forward movement A of the seat cushion 2 due to the forward inertial force can be prevented by the engagement of the striker 7 and the wire frame 8 as described above. The uplift B (see FIG. 9) in which the end 11 is lifted upward cannot be prevented. Therefore, it is necessary to provide another lock mechanism in order to prevent the seat cushion 2 from rising B.

The present invention has been made by paying attention to such a conventional technique, and it is possible to prevent rattling of the buckle when not in use and to surely prevent the seat cushion from rising without performing a special operation. A buckle structure for a vehicle seat is provided.

[0009]

According to the first aspect of the present invention,
At the upper and lower ends of the buckle, an upper insertion opening internally provided with a claw that can be engaged with a tongue passed through the webbing, and a lower insertion opening internally provided with a claw that can be engaged with an upwardly-facing piece provided on the floor. The buckle is fixed in a through hole formed in a rear end portion of the seat cushion that is rotatable upright around a front end hinge, and the buckle is fixed to a portion exposed upward from the through hole of the buckle. An operation portion capable of releasing the engagement state of the claw portion is provided.

According to a second aspect of the present invention, a metal plate base provided inside the buckle is provided with a mounting piece projecting outside the case of the buckle, and the mounting piece is provided on the inner surface of the through hole of the seat cushion. It was fixed to the facing frame material via a bracket.

According to the third aspect of the present invention, a biasing means for pushing the disengaged tongue from the upper insertion port is provided at least in the upper insertion port.

According to the fourth aspect of the present invention, the internal structure of the upper insertion port and the lower insertion port is the same structure that is vertically symmetrical.

[0013]

According to the first aspect of the present invention, the occupant is restrained by the seat by engaging the tongue passed through the webbing with the upper insertion opening of the buckle fixed to the rear end of the seat cushion in normal times. it can. Also, if the operating portion of the buckle is pressed while the occupant is seated, the tongue is pulled out from the upper insertion opening, and the restrained state of the occupant can be released. Then, when the operating section is pressed while the occupant is not seated, the seat cushion can be raised and rotated. The buckle is always fixed to the seat cushion, and does not rattle due to vibration during vehicle running. In addition, since the lower insertion opening of the buckle is normally engaged with the upward piece provided on the floor, both forward movement and flipping of the seat cushion are reliably prevented.

According to the second aspect of the invention, since the mounting piece formed on the base of the buckle is fixed to the frame material of the seat cushion, the fixing strength of the buckle is high, the occupant restraint by webbing is improved, and the seat cushion is improved. Is reliably prevented from moving forward and jumping up.

According to the third aspect of the present invention, since the urging means for pushing out the disengaged tongue from the upper insertion port is provided at least in the upper insertion port, it is easy to take out the tongue from the upper insertion port. It is.

According to the fourth aspect of the present invention, since the internal structure of the upper insertion port and the lower insertion port is the same structure that is vertically symmetrical, parts can be shared vertically and the parts cost can be reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described with reference to FIGS.
It will be described based on. In addition, the same reference numerals are given to portions common to the related art, and overlapping description will be omitted.

In this embodiment, a buckle 18 having a structure in which an upper insertion port 16 and a lower insertion port 17 are provided vertically is used. First, the internal structure of the buckle 18 will be described with reference to FIGS.

A relatively thick base 19 made of a metal plate is provided inside the buckle 18. The base 19 has a U-shaped cross section (see FIG. 6), and a narrow width rail portion 21 (see FIG. 4) is formed from the intermediate portion 20 in both the upper and lower directions. An ejector 22 slidable in the vertical direction is engaged with each of the upper and lower rail portions 21, and each of the upper and lower rail portions 21 is urged in a vertical direction by a spring 23 as “biasing means” externally provided on each rail portion 21. Have been. A notch 21 a is formed in a part of the rail portion 21.
The spring 23 can be set from a.

Further, latch plates 24 are provided at upper and lower positions of the respective ejectors 22 so as to be rotatable about respective axes 24a. A claw portion 25 is formed at an end of the latch plate 24 on the intermediate portion 20 side, and an inclined piece bent in a direction opposite to the claw portion 25 is formed at an end opposite to the shaft 24a. 26 are formed. The latch plate 24 is constantly urged in the α direction in the figure by a spring (not shown) combined with the shaft 24a.

The outer side of the buckle 18 is formed by a case 27, and the upper insertion port 16 and the lower
7 is formed, and an operation unit 28 is provided at a position above the outer surface. This operation unit 28 has a rotating shaft 29a at both ends,
The lever 30 is supported by each of the levers 29 and 30, and a leaf spring 31 is mounted on the inner side. This leaf spring 31
The upper end 31a and the lower end 31b of the
Is in contact with the base end of the inclined piece 26 of FIG. As described above, the upper insertion port 16 and the lower insertion port 1 of the buckle 18 are used.
The internal structure of 7 is the same structure that is vertically symmetrical, and each part can be shared by the upper and lower parts.

At one end of the base 19, a mounting piece 19a projecting out of the case 27 is integrally formed.
A through hole 32 is formed at a position near the center of the rear end portion 11 of the seat cushion 2.
The buckle 18 is fixed inside using the mounting piece 19a. That is, the mounting piece 19 a is fixed to the frame member 33 facing the inner surface of the through hole 32 by the bolt / nut means 35 via the bracket 34. The buckle 18 in a fixed state in this manner through holes 32, the operation portion 28 of the side surface is exposed from the through-hole 32 upward, the lower insertion opening 17 at the lower end is in a state close to the vehicle compartment floor F _1.

The lower insertion port 1 of the buckle 18
An upwardly facing piece 36 is fixed to the vehicle cabin floor F ₁ corresponding to 7 by bolts 40. The upward piece 36 has the same shape as the insertion portion 37 of the tongue 14, and has a lock hole 39 that is the same as the lock hole 38 of the insertion portion 37.

Next, the manner of use of the buckle 18 and the rear seat 1 will be described.

When using webbing:

When the occupant is restrained by using the webbing 13, the seat cushion 2 is in a normal state, so that the upward piece 36 is inserted into the lower insertion opening 17 of the buckle 18. The upward piece 36 inserted into the lower insertion opening 17 pushes the lower ejector 22, and the claw 25 of the latch plate 24 is engaged with the lock hole 39 to prevent the upward piece 36 from coming off. . Thus, the seat cushion 2 and the passenger compartment floor F ₁ is, since the state of being bonded via a buckle 18 and the upward piece 36, the seat cushion 2 is also subjected to excessive forward inertial force, the seat cushion 2 Moves forward, or the rear end 11 of the seat cushion 2 "bounces up."
It does not cause or.

Therefore, the webbing 1 is attached to the buckle 18 fixed to the seat cushion 2 in such a state.
3 is pulled out, and the insertion portion 37 of the tongue 14 passed through the webbing 13 is inserted into the upper insertion opening 16 of the buckle 18. Then, the claw portion 25 of the upper latch plate 24 is engaged with the lock hole 38 of the inserted tongue 14, so that the tongue 14 is prevented from coming off, and the occupant can be restrained by the webbing 13 pulled out. Even force is applied from the occupant's body to the webbing 13, as described above, the upward piece 3 lower side of the vehicle compartment floor F ₁ of the buckle 18
6, the force applied to the webbing 13 can be reliably received similarly to the conventional "anchor portion".

When webbing is not used:

In order to release the restraint by the webbing 13, the operating portion 28 provided on the buckle 18 at a portion exposed upward from the through hole 32 is pressed. When the operation unit 28 is pressed, the upper end 3 of the leaf spring 31 attached to the operation unit 28 is pressed.
1a and the lower end 31b are pushed open, and each pushes the tip side of the inclined piece 26 of the latch plate 24, so that the latch plate 24 rotates in the direction β opposite to the urging direction α, and the upper and lower claws The engagement between the portion 25 and the lock holes 38 and 39 is simultaneously released. When the engagement is released, the upper tongue 14 is pushed upward from the upper insertion opening 16 by the ejector 22 urged by the spring 23. However, since the weight of the seat cushion 2 and the occupant is added to the buckle 18, the lower upward piece 36 remains in the lower insertion opening 17, and when the operation unit 28 is released, the claw 25 is locked again. 39, and the state of engagement with the upward piece 36 is maintained as it is.

When the seat cushion is turned upright:

When the seat cushion 2 is to be raised and rotated, the tongue 14 of the webbing 13 is pulled out from the upper insertion opening 16 of the buckle 18 and then the operating portion 28 is pushed again, and the lower claw 25 and the upward piece 36 Is disengaged. Then, the rear end 1 of the seat cushion 2 is left as it is.
1 is lifted, and the entire seat cushion 2 is raised and rotated about the front end hinge 5. Next, the seat back 3 is tilted forward around the lower end hinge 6. Even if the seat cushion 2 is raised and rotated in this manner, the buckle 18 does not change to a fixed state, so that the buckle 18 does not rattle due to vibration or the like during traveling.

In the above embodiment, the operation section 28 for simultaneously releasing the engagement between the tongue 14 and the upward piece 36 has been described. However, the "operation section" for the tongue 14 and the upward piece 36 is separately provided. May be.

The seat back 3 has a structure in which it is attached to the front end of the luggage compartment floor F ₂ by the lower end hinge 6, but the lower end is not the luggage compartment floor F ₂ but the rear end 11 of the seat cushion 2. It may be of a structure that is rotatably mounted on the.

[0034]

According to the first aspect of the present invention, the buckle is always fixed to the seat cushion, so that the buckle does not rattle due to the vibration during traveling of the vehicle. In addition, since the lower insertion opening of the buckle is normally engaged with the upward piece provided on the floor, both forward movement and flipping of the seat cushion are reliably prevented.

According to the second aspect of the invention, since the mounting piece formed on the base of the buckle is fixed to the frame material of the seat cushion, the fixing strength of the buckle is high, the occupant restraint by webbing is improved, and the seat cushion is improved. Is reliably prevented from moving forward and jumping up.

According to the third aspect of the present invention, at least the urging means for pushing the disengaged tongue out of the upper insertion port is provided in the upper insertion port, so that the tongue can be easily removed from the upper insertion port. It is.

According to the fourth aspect of the present invention, since the internal structure of the upper insertion port and the lower insertion port is the same structure that is vertically symmetrical, parts can be shared between the upper and lower parts, and the cost of parts can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a buckle structure of a vehicle seat according to an embodiment of the present invention when webbing is used.

FIG. 2 is a perspective view corresponding to FIG. 1 and showing a state in which a seat cushion is turned upright.

FIG. 3 is an exploded perspective view showing a relationship between a seat cushion and a buckle.

FIG. 4 is a sectional view taken along line SA-SA shown in FIG.

FIG. 5 is a side view showing the internal structure of the buckle.

FIG. 6 is a schematic sectional view taken along line SB-SB shown in FIG.

FIG. 7 is a perspective view showing a state in which a webbing having a buckle structure of a vehicle seat according to a conventional example is used.

FIG. 8 is a perspective view corresponding to FIG. 7, showing a state in which the seat cushion is turned upright.

FIG. 9 is a sectional view taken along the line SC-SC shown in FIG. 8;

[Explanation of symbols]

2 Seat Cushion 3 Seat Back 5 Front Hinge 11 Rear End of Seat Cushion 13 Webbing 14 Tongue 16 Upper Insertion Port 17 Lower Insertion Port 18 Buckle 25 Claw 28 Operation Unit 32 Through Hole 36 Upward Piece F ₁ Cabin Floor F ₂ Load Room floor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-2956 (JP, A) JP-A-2-96238 (JP, U) JP-A-3-77727 (JP, U) JP-A-63 166867 (JP, U) JP-A 60-91545 (JP, U) JP-B 50-22298 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60R 22/26 B60R 22 / 12

Claims (4)

(57) [Claims] At the upper and lower ends of a buckle, an upper insertion opening provided internally with a claw capable of engaging with a tongue passed through a webbing, and a claw capable of engaging an upward piece provided on a floor are internally provided. A lower insertion port provided in the buckle is provided, and the buckle is fixed in a through hole formed in a rear end portion of the seat cushion which is rotatable about a front end hinge, and is exposed upward from the through hole of the buckle. A buckle structure for a vehicle seat, wherein an operating portion capable of releasing an engagement state of each of the claw portions is provided in a portion where the buckle is located. 2. A metal plate base provided inside the buckle is provided with a mounting piece projecting out of the case of the buckle, and the mounting piece is attached to a frame member facing the inner surface of the through hole of the seat cushion. The buckle structure for a vehicle seat according to claim 1, wherein the buckle structure is fixed via a bracket. 3. The buckle structure for a vehicle seat according to claim 1, wherein a biasing means for pushing out the disengaged tongue from the upper insertion opening is provided at least in the upper insertion opening. 4. The buckle structure for a vehicle seat according to claim 1, wherein the internal structures of the upper insertion port and the lower insertion port are vertically symmetrical.